I'd vote for coldsleeping's change, but to be honest, the Erdnase was uninspiring and exactly the same as just about every other Erdnase I've seen performed for a Colour Change Battle here at T11. I was playing with this for about half an hour today in fact, finding ways of making the Erdnase different. Use your hands more, play up the change - perform and sell it as a magical moment. As far as changes that use the "Wave your hand and it changes" approach, many are far superior to the Erdnase in their visual nature; but the Erdnase's beauty in my opinion lies in its mechanics - it's so easy to conceal, which gives you a lot of freedom in terms of presentation.
Exactly where you go is of course up to you, but I would suggest making the change less stiff and rigid and more fluid - with the initial push forward for example, your hand may as well have been metal, you know?